你需要React => v17 React脚本=> v5 webpack => v5

解决问题

1)安装

"fs": "^2.0.0",  // npm i fs
"assert": "^2.0.0",  // npm i assert
"https-browserify": "^1.0.0", // npm i https-browserify
"os": "^0.1.2", // npm i os
"os-browserify": "^0.3.0", // npm i os-browserify
"react-app-rewired": "^2.1.9", //npm i react-app-rewired
"stream-browserify": "^3.0.0", // stream-browserify
"stream-http": "^3.2.0", //stream-http

2)在根目录下创建config-override .js 图像

3)在config-override .js中添加配置

const webpack = require('webpack');
module.exports = function override(config, env) {
    config.resolve.fallback = {
        url: require.resolve('url'),
        fs: require.resolve('fs'),
        assert: require.resolve('assert'),
        crypto: require.resolve('crypto-browserify'),
        http: require.resolve('stream-http'),
        https: require.resolve('https-browserify'),
        os: require.resolve('os-browserify/browser'),
        buffer: require.resolve('buffer'),
        stream: require.resolve('stream-browserify'),
    };
    config.plugins.push(
        new webpack.ProvidePlugin({
            process: 'process/browser',
            Buffer: ['buffer', 'Buffer'],
        }),
    );

    return config;
}

3)更改packages.json

"scripts": {
  "start": "react-app-rewired start",
  "build": "react-app-rewired build",
  "test": "react-app-rewired test",
  "eject": "react-app-rewired eject"
}

问题解决了:)

错误:[webpack < 5用于默认包含node.js核心模块的腻子。

现在情况已经不同了。验证你是否需要这个模块，并为它配置一个填充。

答: Node_modules > react-scripts > config > webpack.config.js

在webpack.config.js文件中添加:

resolve: {
      fallback: { 
        "http": require.resolve("stream-http") ,
         "path": require.resolve("path-browserify") 
        },
}

在create-react-app v17和脚本5.0.0中，你需要在webpack.config.js中添加一个备份，并安装'process'。

   `module.exports = function (webpackEnv) {
      .........
      return {
       .........
      resolve: {
      ..........
      fallback: { "process": require.resolve("process/browser") },`

Create React App刚刚发布了v5，现在实现了Webpack v5。这将完全打破许多库，其中包括web3作为必需的节点核心库腻子将会丢失。

为了快速解决这个问题，你可以在package.json中修改这个:

"react-scripts": "^5.0.0"

这个

"react-scripts": "4.0.3"

在这之后:

rm -r node_modules

rm package-lock.json

npm install

我从express导入路由器时得到这个错误 import {Router} from 'express';

修正后解决 import {Router} from '@angular/ Router ';

我的应用昨天也抛出了同样的错误。我花了几个小时在SO上阅读问题/答案，并尝试了一些。对我有用的是:

https://github.com/ChainSafe/web3.js#troubleshooting-and-known-issues